A personal, guided tour to the best scoops and stories every day in The Wall Street Journal, from Editor in Chief Gerard Baker.

Another mass shooting has struck an American city. The shooter suspected in the massacre of nine people at a historic black South Carolina church—in what authorities called a hate crime—has been identified as Dylann Roof by Charleston police. About a month ago, the family of Mr. Roof became concerned that the 21-year-old had turned into a loner and was involved in racist groups. Among those that he allegedly gunned down at Emanuel AME Church was a reverend who was a high-school track...